IS-IS Circuit Types Supported | Designing Cisco Enterprise Networks

IS-IS Circuit Types Supported

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Question

When a network is designed using IS-IS, which two circuit types are supported? (Choose two.)

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A. B. C. D. E.

BE.

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Intermediate System to Intermediate System (IS-IS) is a routing protocol used to exchange routing information between network devices in a hierarchical routing domain. When designing a network using IS-IS, there are five circuit types available:

  1. Point-to-Point (P2P): This circuit type is used when there is a direct connection between two routers. The two routers are connected by a single link, and there are no other devices connected to that link.

  2. Point-to-Multipoint (P2MP): This circuit type is used when there is a single router connected to multiple other routers. This circuit type is also sometimes referred to as a "hub-and-spoke" topology.

  3. Broadcast: This circuit type is used when there are multiple routers connected to a common medium, such as a LAN. In a broadcast network, all routers receive every broadcast message sent on the network.

  4. Non-Broadcast: This circuit type is similar to the broadcast circuit type, but it is used when the network does not support broadcasting. Instead, packets are sent directly to each neighbor.

  5. Non-Broadcast Multiaccess (NBMA): This circuit type is used when there are multiple routers connected to a network that does not support broadcasting, such as a Frame Relay network. In an NBMA network, packets are sent directly to each neighbor.

Now, let's consider the original question: "When a network is designed using IS-IS, which two circuit types are supported?"

Based on the list of circuit types above, the two correct answers are A. Non-Broadcast Multiaccess (NBMA) and E. Point-to-Point (P2P). IS-IS supports these circuit types along with the other three circuit types mentioned above.

It's worth noting that each circuit type has its own unique characteristics and requirements, and the choice of circuit type will depend on the specific network topology and requirements. For example, P2P circuit type is often used in WAN links, while NBMA is used in Frame Relay networks.

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